CN109938755A - The critical value measurement method of flicker fusion frequency based on set of digits identification - Google Patents
The critical value measurement method of flicker fusion frequency based on set of digits identification Download PDFInfo
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Abstract
A kind of critical value measurement method of flicker fusion frequency based on set of digits identification: it is provided with N number of day font digital frame in the bias light region flashed in the frequency with setting, and distributes title to each stroke of day font digital frame；The combination for ten groups of different frequencies that setting respectively applies N number of day font digital frame；To the stroke of each frequency distribution day font digital frame in every group of different frequency combination；One group is all arbitrarily chosen from the combination of ten groups of different frequencies to each of N number of day font digital frame day font digital frame；In determining N group combination of frequency in each group of combination of frequency each frequency value；Measured identifies the N number of day number flashed on font digital frame in the bias light region in the frequency range of setting；The range or final flicker fusion frequency critical value of the flicker fusion frequency critical value of measured are judged according to the result that measured identifies.Measurement process of the present invention simplifies, and ensure that higher identification discrimination, and measurement result has objectivity.
Description
Technical field
The present invention relates to a kind of critical value measurement methods of flicker fusion frequency.It is recognized more particularly to one kind based on set of digits
The critical value measurement method of flicker fusion frequency.
Background technique
Flicker fusion refers to when stimulation is not continuous action but discontinuously effect, with the increase of interruption frequency,
What is felt is no longer interrupted stimulation, but a kind of scene continuously stimulated, it is seen that a series of flash of light, when every point
The number increase of clock to a certain extent when, human eye is just no longer felt to glisten, and feels it is a kind of fixation or continuous light, in vision
In, this phenomenon is known as flicker fusion phenomenon.Such as: using the fluorescent lamp of alternating current, although flashing about 100 each second,
We do not feel that it is interrupted.
Flicker fusion can just be caused to feel that the minimum frequency of the stimulation of (fusion) is called the critical frequency of flicker fusion
Rate, also referred to as flicker fusion frequency critical value.
The instrument of traditional measurement flicker fusion frequency critical value is generally also referred to as bright spot scintiloscope.Measurement measured's
When flicker fusion frequency critical value, initial bright spot flicker frequency is 10.0HZ, and measured's observation is located at observation cylinder vision center
Bright spot, continuous speed regulation button is until feel that bright spot no longer flashes, but continuous luminous bright spot.Device
To the flicker frequency of the bright spot of flashing linearly increasing 0.1hz every time, just stop rotating after measured feels that dot no longer flashes
Frequency regulator records flicker value this moment, this value is flicker fusion frequency critical value.
There are the following problems for existing measuring device and technology:
(1) 0.1hz is adjusted every time, illustrates that measurement accuracy is accurate only to 0.1hz, accuracy is lower；
(2) the measured might have subjective tendency, and measurement result may be by subjective impact；
(3) for existing measurement method when measuring flicker fusion frequency critical value, every secondary frequencies are adjusted to 0.1hz, measurement
Time is long, and measured is easy to generate fatigue in prolonged measurement process, influences measurement effect；
(4) the critical value measurement method of existing flicker fusion frequency is given one when measurement every time and is flashed with fixed frequency
Cursor, if it is desired to accelerate measuring speed will increase measurement cursor quantity, the measurement load of testee itself can be increased,
Measurement process is more complicated, may have an impact to measurement effect.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of test process is simple and quick, measured can faster, it is more smart
The true critical value measurement method of flicker fusion frequency measuring its flicker fusion frequency critical value and being recognized based on set of digits.
The technical scheme adopted by the invention is that: a kind of flicker fusion frequency critical value measurement side based on set of digits identification
Method includes the following steps:
1) measurement scheme is set, including being provided with N number of day in the bias light region that is flashed in the frequency with setting
Font digital frame, N value are 2~4, and distribute title to each stroke of day font digital frame, specifically by day font number
In frame:
Three horizontal stroke is from top to bottom successively known as the first horizontal line, the second horizontal line and third horizontal line；The left side is located at the first horizontal line
Perpendicular draw between the second horizontal line is known as the first vertical line；Perpendicular draw of the left side between the second horizontal line and third horizontal line is known as second
Vertical line；Perpendicular draw of the right between the first horizontal line and the second horizontal line is known as third vertical line；The right is located at the second horizontal line and third
Perpendicular draw between horizontal line is known as the 4th vertical line；
2) combination for ten groups of different frequencies that setting respectively applies N number of day font digital frame, each group of different frequency
Each frequency range is 20~50HZ in combination；
3) to the stroke of each frequency distribution day font digital frame in every group of different frequency combination；
4) random all from the combination of ten groups of different frequencies to each of N number of day font digital frame day font digital frame
One group is chosen, chooses N group altogether, and in the N group, different frequency in the first day obtained group of frequencies of font digital frame
Number B1In than remaining day obtained group of frequencies of font digital frame one more than the number B of different frequency；
5) value for determining each frequency in each group of combination of frequency in N group combination of frequency described in step 4), can make difference
Measured is according to itself flicker fusion critical frequency, it is seen that the 0~N number of Any Digit flashing between 0~9；
6) measured identifies the N number of day number flashed on font digital frame in the bias light region in the frequency range of setting
Word；
7) according to measured's identification it can be seen that the flicker fusion frequency of digital judgement measured of 0~N number of flashing face
The range of dividing value or final flicker fusion frequency critical value.
The frequency of the setting in the bias light region flashed in the frequency of setting described in step 1) is 60HZ or more
Frequency.
The combination for ten groups of different frequencies that setting respectively applies N number of day font digital frame described in step 2), comprising:
First group of different frequency combination: frequency is followed successively by first frequency, second frequency, third frequency, the 4th from low to high
Frequency and the 5th frequency composition；
Second group of different frequency combination: frequency is followed successively by the 6th frequency, the 7th frequency, the 8th frequency and the 9th from low to high
Frequency composition；
Third group different frequency combination: frequency be followed successively by from low to high the tenth frequency, the 11st frequency, the 12nd frequency and
13rd frequency composition；
4th group of different frequency combination: frequency is followed successively by the 14th frequency, the 15th frequency, the 16th frequency from low to high
It is formed with the 17th frequency；
5th group of different frequency combination: frequency is followed successively by the 18th frequency, the 19th frequency and the 20th frequency from low to high
Rate composition；
6th group of different frequency combination: frequency is followed successively by the 21st frequency, the 22nd frequency and second from low to high
13 frequencies composition；
7th group of different frequency combination: frequency is followed successively by the 24th frequency, the 25th frequency and second from low to high
16 frequencies composition；
8th group of different frequency combination: frequency is followed successively by the 27th frequency and the 28th frequency composition from low to high.
9th group of different frequency combination: frequency is followed successively by the 29th frequency and the 30th frequency composition from low to high；
Tenth group of different frequency combination: frequency is followed successively by the 31st frequency and the 32nd frequency composition from low to high；
To the stroke of each frequency distribution day font digital frame in every group of different frequency combination described in step 3), specifically
It is as follows:
(1) first group of different frequency is combined:
Third vertical line and the 4th vertical line are to first frequency；First horizontal line is to second frequency；Second horizontal line and third horizontal line are given
Third frequency；First vertical line gives the 4th frequency；Second vertical line gives the 5th frequency；
(2) second group of different frequency is combined:
Third vertical line and the 4th vertical line give the 6th frequency；First horizontal line gives the 7th frequency；First vertical line, the second vertical line and
Three horizontal lines give the 8th frequency；Second horizontal line gives the 9th frequency；
(3) third group different frequency is combined:
Third vertical line and the 4th vertical line give the tenth frequency；First vertical line and the second horizontal line give the 11st frequency；First horizontal line
The 12nd frequency is given with third horizontal line；Second vertical line gives the 13rd frequency；
(4) the 4th group of different frequency is combined:
First horizontal line, third vertical line and the 4th vertical line give the 14th frequency；Second horizontal line and third horizontal line are to the 15th frequency
Rate；First vertical line gives the 16th frequency；Second vertical line gives the 17th frequency；
(5) the 5th group of different frequency is combined:
First horizontal line, the second horizontal line, third horizontal line, the first vertical line and the 4th vertical line give the 18th frequency；Second vertical line is given
19th frequency；Third vertical line gives the 20th frequency；
(6) the 6th group of different frequency is combined:
First horizontal line, the second horizontal line, third horizontal line, the first vertical line and the 4th vertical line give the 21st frequency；Third vertical line
To the 22nd frequency；Second vertical line gives the 23rd frequency；
(7) the 7th group of different frequency is combined:
Third vertical line and the 4th vertical line give the 24th frequency；First horizontal line, third horizontal line, the first vertical line and the second vertical line
To the 25th frequency；Second horizontal line gives the 26th frequency；
(8) the 8th group of different frequency is combined:
First horizontal line, the second horizontal line, third horizontal line, the second vertical line and third vertical line give the 27th frequency；First vertical line
The 28th frequency is given with the 4th vertical line.
(9) the 9th group of different frequency is combined:
First horizontal line, the second horizontal line, third horizontal line, the first vertical line and the 4th vertical line give the 29th frequency；Second vertical line
The 30th frequency is given with third vertical line.
(10) the tenth group of different frequency is combined:
First horizontal line, third vertical line and the 4th vertical line give the 31st frequency；Second horizontal line, third horizontal line, the first vertical line
The 32nd frequency is given with the second vertical line.
Step 5) is that the value of each frequency in each group of combination of frequency is determined using following formula:
fJ, i=F0+ Δ f ' (j-1)+Δ f (i-1), f1, B+1=F1
Wherein, fJ, iRefer to i-th of frequency in the j-th day obtained combination of frequency of font digital frame from low to high
Value, the value range of i is 1~B, and the value range of j is 1~N；F0It is the lower limit of each round measurement range, F1It is each wheel measurement
The upper limit of range, measurement range F0~F1It indicates, initial measurement range is 20HZ~50HZ；Δ f ' is adjacent two days word
The difference between minimum frequency in the obtained combination of frequency of type digital frame, the value of Δ f ' is determined using following formula:
Wherein, BaIt is the number for the whole different frequencies for including in the obtained N group combination of frequency of N number of day font digital frame
The sum of, B is determined using following formulaaValue:
Wherein, BjIt is the number of different frequency in the j-th day obtained group of frequencies of font digital frame, using following formula
Determine BjValue:
B2=B3=...=BN=B, B1=B+1
Δ f is the difference between each side frequency in the same obtained combination of frequency of day font digital frame, is used
Following formula determines the value of Δ f:
Δ f=N* Δ f '
f1, B+1It is the highest frequency value in the first day obtained combination of frequency of font digital frame.
Step 7) includes:
(7.1) when measured identifies that the number of flashing numerals is 0, the upper limit F of measurement range is reset1For measured
Minimum frequency value in unidentified N group different frequency combination out, the lower limit F of measurement range0=F1- 2* Δ f, and return step
4)
(7.2) when measured identifies that the number of flashing numerals is N, and each is digital 8, measurement range is reset
Lower limit F0The maximum frequency values in the combination of N group different frequency identified for measured, the upper limit F of measurement range1=F0+2*
Δ f, and return step 4)；
(7.3) when measured identify flashing numerals number be greater than 0 be less than N, and not all digital 8 when, reset
The lower limit F of measurement range0The maximum frequency values in the combination of N group different frequency identified for measured, measurement range it is upper
Limit F1=F0+ Δ f ', judges F1-F0Whether less than 0.2, if it is entering (7.4) step, otherwise return step 4)；
(7.4) according to the flicker fusion frequency critical value formula (F of measured0+F1)/2, measurement accuracy formula (F1-F0)/
2, it obtains the flicker fusion frequency critical value and measurement accuracy of the measured, terminates measurement.
The critical value measurement method of flicker fusion frequency based on set of digits identification of the invention, each wheel measurement are all identification
The day font digital frame of fixed number, and include multiple and different frequencies, the pen of identical frequency in each day font digital frame
It draws to be arranged from low to high according to frequency and can constitute 0~9 totally ten different numbers.Measured can be in each day font digital frame
In recognize less than itself flicker fusion frequency critical value number flashing, it is possible thereby to most three-wheels test after obtain by
The flicker fusion frequency critical value of survey person or the range of flicker fusion frequency critical value.Simultaneously in view of measurement accuracy is to final
The influence of measurement result, the average value of the maximum frequency values for taking measured to identify and the unidentified minimum frequency value out of measured
As measurement result.Based on this present invention has the advantage that
1, the present invention is when carrying out the measurement of flicker fusion frequency critical value, by being in the digital frame of each day font
Different frequencies is arranged in each stroke, i.e. each day font digital frame includes multiple and different frequencies, at most 3 wheel of measurement, just
Measurement accuracy value can be reduced to 0.1 hereinafter, improving measuring speed；
2, the present invention is avoided that the subjective impact of measured, makes to measure when carrying out the measurement of flicker fusion frequency critical value
As a result there is objectivity；
3, the present invention makes measured identify 2~4 numbers every time, reduces the measurement load of measured, simplifies measurement process；
4, when the present invention assigns different frequency value for each stroke that each day font digital frame is included, the same day word
Side frequency difference in type digital frame is larger, and the number in 0~9 can be combined between the corresponding stroke of side frequency, makes
Measured can be more clearly visible which number is flashing, and ensure that higher identification discrimination.
5, the present invention is when calculating the measurement result of final flicker fusion frequency critical value, it is contemplated that measurement accuracy is to knot
The influence of fruit, final measurement take the average value of the maximum frequency values identified and unidentified minimum frequency value out, measurement
Accuracy value is the half of the difference of unidentified minimum frequency value and the maximum frequency values identified out.
6, present invention provide that the difference of the minimum frequency value and the maximum frequency values identified that go out when measured is unidentified is necessary
Just terminate to measure when less than 0.2, this method, can be most three by the way that multiple and different frequencies is arranged in day font digital frame
Make ultimate measurement accuracy value even far smaller than 0.1 less than 0.1 after wheel.Therefore flicker fusion frequency critical value can be greatly improved
The accuracy of measurement result；
Detailed description of the invention
Fig. 1 is that the present invention is based on the flow charts of the critical value measurement method of flicker fusion frequency of set of digits identification；
Fig. 2 is the number of the stroke composition of the different frequency in from top to bottom first group to the tenth group of different frequency combination
Schematic diagram.
Specific embodiment
The flicker fusion frequency critical value of the invention based on set of digits identification is measured below with reference to embodiment and attached drawing
Method is described in detail.
As shown in Figure 1, the flicker fusion frequency critical value measurement method of the invention based on set of digits identification, including it is as follows
Step:
1) measurement scheme is set, including being provided with N number of day in the bias light region that is flashed in the frequency with setting
Font digital frame, N value are 2~4, and distribute title to each stroke of day font digital frame, specifically by day font number
In frame:
Three horizontal stroke is from top to bottom successively known as the first horizontal line, the second horizontal line and third horizontal line；The left side is located at the first horizontal line
Perpendicular draw between the second horizontal line is known as the first vertical line；Perpendicular draw of the left side between the second horizontal line and third horizontal line is known as second
Vertical line；Perpendicular draw of the right between the first horizontal line and the second horizontal line is known as third vertical line；The right is located at the second horizontal line and third
Perpendicular draw between horizontal line is known as the 4th vertical line；
The frequency of the setting in the bias light region flashed in the frequency of the setting is the frequency of 60HZ or more.
2) combination for ten groups of different frequencies that setting respectively applies N number of day font digital frame, due to the sudden strain of a muscle of most people
Light fusion frequency critical value range all in 20~50HZ, so in the combination of each group of different frequency each frequency range be 20~
50HZ；Include:
First group of different frequency combination includes five different frequencies: frequency is followed successively by first frequency, second from low to high
Frequency, third frequency, the 4th frequency and the 5th frequency composition；
Second group of different frequency combination includes four different frequencies: frequency is followed successively by the 6th frequency, the 7th from low to high
Frequency, the 8th frequency and the 9th frequency composition；
The combination of third group different frequency includes four different frequencies: frequency is followed successively by the tenth frequency, the tenth from low to high
One frequency, the 12nd frequency and the 13rd frequency composition；
The combination of 4th group of different frequency includes four different frequencies: frequency is followed successively by the 14th frequency, the from low to high
15 frequencies, the 16th frequency and the 17th frequency composition；
The combination of 5th group of different frequency includes three different frequencies: frequency is followed successively by the 18th frequency, the from low to high
19 frequencies and the 20th frequency composition；
The combination of 6th group of different frequency includes three different frequencies: frequency be followed successively by from low to high the 21st frequency,
22nd frequency and the 23rd frequency composition；
The combination of 7th group of different frequency includes three different frequencies: frequency be followed successively by from low to high the 24th frequency,
25th frequency and the 26th frequency composition；
The combination of 8th group of different frequency includes two different frequencies: frequency be followed successively by from low to high the 27th frequency and
28th frequency composition.
The combination of 9th group of different frequency includes two different frequencies: frequency be followed successively by from low to high the 29th frequency and
30th frequency composition；
The combination of tenth group of different frequency includes two different frequencies: frequency be followed successively by from low to high the 31st frequency and
32nd frequency composition；
3) to the stroke of each frequency distribution day font digital frame in every group of different frequency combination；It is specific as follows:
(1) first group of different frequency is combined:
Third vertical line and the 4th vertical line are to first frequency；First horizontal line is to second frequency；Second horizontal line and third horizontal line are given
Third frequency；First vertical line gives the 4th frequency；Second vertical line gives the 5th frequency；
Each stroke in day font digital frame, 1,7,3,9,8 this five numbers can be successively constituted according to frequency from low to high
Word；
(2) second group of different frequency is combined:
Third vertical line and the 4th vertical line give the 6th frequency；First horizontal line gives the 7th frequency；First vertical line, the second vertical line and
Three horizontal lines give the 8th frequency；Second horizontal line gives the 9th frequency；
Each stroke in day font digital frame, 1,7,0,8 this four numbers can be successively constituted according to frequency from low to high；
(3) third group different frequency is combined:
Third vertical line and the 4th vertical line give the tenth frequency；First vertical line and the second horizontal line give the 11st frequency；First horizontal line
The 12nd frequency is given with third horizontal line；Second vertical line gives the 13rd frequency；
Each stroke in day font digital frame, 1,4,9,8 this four numbers can be successively constituted according to frequency from low to high；
(4) the 4th group of different frequency is combined:
First horizontal line, third vertical line and the 4th vertical line give the 14th frequency；Second horizontal line and third horizontal line are to the 15th frequency
Rate；First vertical line gives the 16th frequency；Second vertical line gives the 17th frequency；
Each stroke in day font digital frame, 7,3,9,8 this four numbers can be successively constituted according to frequency from low to high；
(5) the 5th group of different frequency is combined:
First horizontal line, the second horizontal line, third horizontal line, the first vertical line and the 4th vertical line give the 18th frequency；Second vertical line is given
19th frequency；Third vertical line gives the 20th frequency；
Each stroke in day font digital frame can successively constitute 5,6,8 these three numbers according to frequency from low to high；
(6) the 6th group of different frequency is combined:
First horizontal line, the second horizontal line, third horizontal line, the first vertical line and the 4th vertical line give the 21st frequency；Third vertical line
To the 22nd frequency；Second vertical line gives the 23rd frequency；
Each stroke in day font digital frame can successively constitute 5,9,8 these three numbers according to frequency from low to high；
(7) the 7th group of different frequency is combined:
Third vertical line and the 4th vertical line give the 24th frequency；First horizontal line, third horizontal line, the first vertical line and the second vertical line
To the 25th frequency；Second horizontal line gives the 26th frequency；
Each stroke in day font digital frame can successively constitute 1,0,8 these three numbers according to frequency from low to high；
(8) the 8th group of different frequency is combined:
First horizontal line, the second horizontal line, third horizontal line, the second vertical line and third vertical line give the 27th frequency；First vertical line
The 28th frequency is given with the 4th vertical line.
Each stroke in day font digital frame can successively constitute 2,8 the two numbers according to frequency from low to high；
(9) the 9th group of different frequency is combined:
First horizontal line, the second horizontal line, third horizontal line, the first vertical line and the 4th vertical line give the 29th frequency；Second vertical line
The 30th frequency is given with third vertical line.
Each stroke in day font digital frame can successively constitute 5,8 the two numbers according to frequency from low to high；
(10) the tenth group of different frequency is combined:
First horizontal line, third vertical line and the 4th vertical line give the 31st frequency；Second horizontal line, third horizontal line, the first vertical line
The 32nd frequency is given with the second vertical line.
Each stroke in day font digital frame can successively constitute 7,8 the two numbers according to frequency from low to high；
4) random all from the combination of ten groups of different frequencies to each of N number of day font digital frame day font digital frame
One group is chosen, chooses N group altogether, and in the N group, different frequency in the first day obtained group of frequencies of font digital frame
Number B1In than remaining day obtained group of frequencies of font digital frame one more than the number B of different frequency；
5) value for determining each frequency in each group of combination of frequency in N group combination of frequency described in step 4), can make difference
Measured is according to itself flicker fusion critical frequency, it is seen that the 0~N number of Any Digit flashing between 0~9；
It is the value that each frequency in each group of combination of frequency is determined using following formula:
fJ, i=F0+ Δ f ' (j-1)+Δ f (i-1), f1, B+1=F1
Wherein, fJ, iRefer to i-th of frequency in the j-th day obtained combination of frequency of font digital frame from low to high
Value, the value range of i is 1~B, and the value range of j is 1~N；F0It is the lower limit of each round measurement range, F1It is each wheel measurement
The upper limit of range, measurement range F0~F1It indicates, initial measurement range is 20HZ~50HZ；Δ f ' is adjacent two days word
The difference between minimum frequency in the obtained combination of frequency of type digital frame, the value of Δ f ' is determined using following formula:
Wherein, BaIt is the number for the whole different frequencies for including in the obtained N group combination of frequency of N number of day font digital frame
The sum of, B is determined using following formulaaValue:
Wherein, BjIt is the number of different frequency in the j-th day obtained group of frequencies of font digital frame, using following formula
Determine BjValue:
B2=B3=...=BN=B, B1=B+1
Δ f is the difference between each side frequency in the same obtained combination of frequency of day font digital frame, is used
Following formula determines the value of Δ f:
Δ f=N* Δ f '
f1, B+1It is the highest frequency value in the first day obtained combination of frequency of font digital frame.
6) measured identifies the N number of day number flashed on font digital frame in the bias light region in the frequency range of setting
Word；
7) according to measured's identification it can be seen that the flicker fusion frequency of digital judgement measured of 0~N number of flashing face
The range of dividing value or final flicker fusion frequency critical value.Include:
(7.1) when measured identifies that the number of flashing numerals is 0, the upper limit for resetting measurement range is several for measured
Minimum frequency value in unidentified N group different frequency combination out, the lower limit F of measurement range0=F1- 2* Δ f, and return step
4)
(7.2) when measured identifies that the number of flashing numerals is N, and each is digital 8, measurement range is reset
Lower limit F0The maximum frequency values in the combination of N group different frequency identified for measured, the upper limit F of measurement range1=F0+2*
Δ f, and return step 4)；
(7.3) when measured identify flashing numerals number be greater than 0 be less than N, and not all digital 8 when, reset
The lower limit F of measurement range0The maximum frequency values in the combination of N group different frequency identified for measured, measurement range it is upper
Limit F1=F0+ Δ f ', judges F1-F0Whether less than 0.2, if it is entering (7.4) step, otherwise return step 4)；
(7.4) according to the flicker fusion frequency critical value formula (F of measured0+F1)/2, measurement accuracy formula (F1-F0)/
2, it obtains the flicker fusion frequency critical value and measurement accuracy of the measured, terminates measurement.
It is given below specific:
Example 1:
(1) 3 day font digital frame is placed in bias light region；
(2) two days font digital frame includes the different frequency number ratio for including according to the first day font digital frame below
Different frequency number more 1 principle, the first day font digital frame selects first group of combination of frequency, the second day font number
Frame selects second group of combination of frequency, and third day font digital frame selects third group combination of frequency；
(3) each frequency assignment in each group of combination of frequency chosen for the first wheel measurement:
First run measurement range is 20HZ to 50HZ, so according to formula F1=50, F0=20 (units: HZ), N=3, B=4,
B1=5, B2=B3=4, Ba=13, Δ f '=(50-20)/(13-1)=2.5, Δ f=3*2.5=7.5, fJ, i=20+ Δ f '
(j-1)+Δ f (i-1), (i=1,2,3,4, j=1,2,3) determine first group of group of frequencies in the first day font digital frame
It closes, the third group combination of frequency in second group of combination of frequency in the second day font digital frame and third day font digital frame
In the following matrix of each frequency values shown in, fJ, iIt can be expressed as the matrix of j row i column, j-th of digital frame is represented and choose
Combination of frequency in ascending i-th of frequency value:
4 frequencies of the first row are ascending in first group of combination of frequency of the first day font digital frame selection respectively
Preceding 4 different frequencies, i.e., the third vertical line in the first day font digital frame and the 4th vertical line are to 20HZ；First horizontal line is given
27.5HZ；Second horizontal line and third horizontal line are to 35HZ；First vertical line is to 42.5HZ；f1,5Mean that first digit frame is chosen
First group of combination of frequency in maximum frequency, that is, the second vertical line is to 50HZ；
4 frequencies of the second row are ascending in second group of combination of frequency in the second day font digital frame respectively
4 different frequencies, i.e., the third vertical line in the second day font digital frame and the 4th vertical line are to 22.5HZ；First horizontal line is given
30HZ；First vertical line, the second vertical line and third horizontal line are to 37.5HZ；Second horizontal line is to 45HZ；
4 frequencies of the third line are ascending in third group combination of frequency in third day font digital frame respectively
4 different frequencies, i.e. third vertical line and the 4th vertical line are to 25HZ；First vertical line and the second horizontal line are to 32.5HZ；First horizontal line
With third horizontal line to 40HZ；Second vertical line is to 47.5HZ；
(4) number in flashing that measured identifies is respectively 7,7,1, i.e. first in the first day font digital frame
Frequency 20HZ, second frequency 27.5HZ, first frequency 22.5HZ, second frequency 30HZ in the second day font digital frame, with
And the first frequency 25HZ in third day font digital frame is identified, and illustrates the frequency recognized in this wheel measurement of measured
The maximum value of rate is 30HZ, chooses lower limit of the 30HZ as next round measurement range, the upper limit of next round measurement range is: 30+
2.5=32.5；That is F1=32.5；F0=30, F1-F0=2.5 are not less than 0.2, continue the measurement of the second wheel.
In (5) second wheel measurements, the different frequency number for including according to the first day font digital frame is than two day below
The principle for the different frequency number more 1 that font digital frame includes, the first day font digital frame select third group combination of frequency, the
Two days font digital frame selects the 5th group of combination of frequency, and third day font digital frame selects the 6th group of combination of frequency；
(6) each frequency assignment in each group of combination of frequency chosen for the second wheel measurement:
Second wheel measurement range is 30HZ to 32.5HZ, so according to formula F1=32.5, F0=30 (units: HZ), N=
3, B=3, B1=4, B2=B3=3, Ba=10, Δ f '=(32.5-30)/(10-1)=0.28, Δ f=3*0.28=0.84,
fJ, i=30+ Δ f ' (j-1)+Δ f (i-1), (i=1,2,3, j=1,2,3), determines the third in the first day font digital frame
The 6th group in group combination of frequency, the 5th group of combination of frequency in the second day font digital frame and third day font digital frame
Shown in the following matrix of each frequency values in combination of frequency:
3 frequencies of the first row are ascending in the third group combination of frequency of the first day font digital frame selection respectively
Preceding 3 different frequencies, i.e., the third vertical line in the first day font digital frame and the 4th vertical line are to 30HZ；First vertical line and
Second horizontal line is to 30.84HZ；First horizontal line and third horizontal line are to 31.68HZ；fIsosorbide-5-NitraeMean first digit frame is chosen the
Maximum frequency in three groups of combination of frequencies, that is, the second vertical line is to 32.5HZ；
3 frequencies of the second row are ascending in the 5th group of combination of frequency in the second day font digital frame respectively
3 different frequencies, i.e., the first horizontal line, the second horizontal line, third horizontal line, the first vertical line in the second day font digital frame and
Four vertical lines are to 30.28HZ；Second vertical line is to 31.12HZ；Third vertical line is to 31.96HZ；
3 frequencies of the third line are ascending in the 6th group of combination of frequency in third day font digital frame respectively
3 different frequencies, i.e. the first horizontal line, the second horizontal line, third horizontal line, the first vertical line and the 4th vertical line are to 30.56HZ；Third is perpendicular
Line is to 31.4HZ；Second vertical line is to 32.24HZ；
(7) number for the flashing that measured identifies is respectively 1,5,5, i.e., the tenth frequency in the first day font digital frame
Second in rate 30HZ, the 18th frequency 30.28HZ in the second day font digital frame and third day font digital frame
11 frequency 30.56HZ are identified, and illustrate that the maximum value of the frequency recognized in this wheel measurement of measured is 30.56HZ,
Lower limit of the 30.56HZ as next round measurement range is chosen, the upper limit of next round measurement range is: 30.56+0.28=30.84；
That is F1=30.84；F0=30.56,30.56-30.28=0.28 are not less than 0.2, then continue the measurement of third round.
(8) in third wheel measurement, the different frequency number for including according to the first day font digital frame is than two below
The principle for the different frequency number more 1 that day font digital frame includes, the first day font digital frame select third group combination of frequency,
Second day font digital frame selects the 6th group of combination of frequency, and third day font digital frame selects the 5th group of combination of frequency；
(9) each frequency assignment in each group of combination of frequency chosen for third wheel measurement:
Third round measurement range is 30.56HZ to 30.84HZ, so according to formula F1=30.84, F0=30.56 (unit:
HZ), N=3, B=3, B1=4, B2=B3=3, Ba=10, Δ f=(30.84-30.56)/(10-1)=0.031, Δ f=3*
0.031=0.093, fJ, i=30.56+ Δ f ' (j-1)+Δ f (i-1), (i=1,2,3, j=1,2,3), determines the first day word
Third group combination of frequency in type digital frame, the 6th group of combination of frequency in the second day font digital frame and third day font
Shown in the following matrix of each frequency values in the 5th group of combination of frequency in digital frame:
3 frequencies of the first row are ascending in the third group combination of frequency of the first day font digital frame selection respectively
Preceding 3 different frequencies, i.e., the third vertical line in the first day font digital frame and the 4th vertical line are to 30.56HZ；First is perpendicular
Line and the second horizontal line are to 30.653HZ；First horizontal line and third horizontal line are to 30.746HZ；fIsosorbide-5-NitraeMean that first digit frame selects
The maximum frequency in third group combination of frequency taken, that is, the second vertical line is to 30.84HZ；
3 frequencies of the second row are ascending in the 6th group of combination of frequency in third day font digital frame respectively
3 different frequencies, i.e. the first horizontal line, the second horizontal line, third horizontal line, the first vertical line and the 4th vertical line are to 30.591HZ；Third
Vertical line is to 30.684HZ；Second vertical line is to 30.777HZ；
3 frequencies of the third line are ascending in the 5th group of combination of frequency in the second day font digital frame respectively
3 different frequencies, i.e., the first horizontal line, the second horizontal line, third horizontal line, the first vertical line in the second day font digital frame and
Four vertical lines are to 30.622HZ；Second vertical line is to 30.725HZ；Third vertical line is to 30.808HZ；
(10) number for the flashing that measured identifies is respectively 1,5, i.e., the tenth frequency in the first day font digital frame
Rate 30.56HZ, the 21st frequency 30.591HZ in the second day font digital frame are identified, and illustrate this wheel of measured
The maximum value of the frequency recognized in measurement is 30.591HZ, chooses lower limit of the 30.591HZ as next round measurement range, under
The upper limit of one wheel measurement range is: 30.591+0.031=30.622；That is F1=30.622；F0=30.591,30.622-
30.591=0.031 is far smaller than 0.2, and the final flicker fusion frequency critical value for calculating measured is 1/2 (30.591+
30.622)=30.607, measurement accuracy 0.031/2=0.0155 terminates measurement.
Claims (6)
1. a kind of critical value measurement method of flicker fusion frequency based on set of digits identification, which comprises the steps of:
1) measurement scheme is set, including being provided with N number of day font in the bias light region that is flashed in the frequency with setting
Digital frame, N value are 2~4, and give each stroke of day font digital frame distribution title, specifically will be in day font digital frame:
Three horizontal stroke is from top to bottom successively known as the first horizontal line, the second horizontal line and third horizontal line；The left side is located at the first horizontal line and
Perpendicular draw between two horizontal lines is known as the first vertical line；It is perpendicular that the left side erecting between the second horizontal line and third horizontal line draws referred to as second
Line；Perpendicular draw of the right between the first horizontal line and the second horizontal line is known as third vertical line；The right is located at the second horizontal line and third is horizontal
Perpendicular draw between line is known as the 4th vertical line；
2) combination for ten groups of different frequencies that setting respectively applies N number of day font digital frame, the combination of each group of different frequency
In each frequency range be 20~50HZ；
3) to the stroke of each frequency distribution day font digital frame in every group of different frequency combination；
4) each of N number of day font digital frame day font digital frame is all arbitrarily chosen from the combination of ten groups of different frequencies
One group, N group is chosen altogether, and in the N group, of different frequency in the first day obtained group of frequencies of font digital frame
Number B1In than remaining day obtained group of frequencies of font digital frame one more than the number B of different frequency；
5) value for determining each frequency in each group of combination of frequency in N group combination of frequency described in step 4) can make different tested
Person is according to itself flicker fusion critical frequency, it is seen that the 0~N number of Any Digit flashing between 0~9；
6) measured identifies the N number of day number flashed on font digital frame in the bias light region in the frequency range of setting；
7) according to measured's identification it can be seen that 0~N number of flashing digital judgement measured flicker fusion frequency critical value
Range or final flicker fusion frequency critical value.
2. the flicker fusion frequency critical value measurement method according to claim 1 based on set of digits identification, feature exist
In the frequency of the setting in the bias light region flashed in the frequency of setting described in step 1) is the frequency of 60HZ or more
Rate.
3. the flicker fusion frequency critical value measurement method according to claim 1 based on set of digits identification, feature exist
In the combination for ten groups of different frequencies that setting respectively applies N number of day font digital frame described in step 2), comprising:
First group of different frequency combination: frequency is followed successively by first frequency, second frequency, third frequency, the 4th frequency from low to high
It is formed with the 5th frequency；
Second group of different frequency combination: frequency is followed successively by the 6th frequency, the 7th frequency, the 8th frequency and the 9th frequency from low to high
Composition；
The combination of third group different frequency: frequency is followed successively by the tenth frequency, the 11st frequency, the 12nd frequency and the tenth from low to high
Three frequencies composition；
The combination of 4th group of different frequency: frequency is followed successively by the 14th frequency, the 15th frequency, the 16th frequency and the from low to high
17 frequencies composition；
5th group of different frequency combination: frequency is followed successively by the 18th frequency, the 19th frequency and the 20th group of frequencies from low to high
At；
6th group of different frequency combination: frequency is followed successively by the 21st frequency, the 22nd frequency and the 23rd from low to high
Frequency composition；
7th group of different frequency combination: frequency is followed successively by the 24th frequency, the 25th frequency and the 26th from low to high
Frequency composition；
8th group of different frequency combination: frequency is followed successively by the 27th frequency and the 28th frequency composition from low to high.
9th group of different frequency combination: frequency is followed successively by the 29th frequency and the 30th frequency composition from low to high；
Tenth group of different frequency combination: frequency is followed successively by the 31st frequency and the 32nd frequency composition from low to high.
4. the flicker fusion frequency critical value measurement method according to claim 1 based on set of digits identification, feature exist
In specific as follows to the stroke of each frequency distribution day font digital frame in every group of different frequency combination described in step 3):
(1) first group of different frequency is combined:
Third vertical line and the 4th vertical line are to first frequency；First horizontal line is to second frequency；Second horizontal line and third horizontal line are to third
Frequency；First vertical line gives the 4th frequency；Second vertical line gives the 5th frequency；
(2) second group of different frequency is combined:
Third vertical line and the 4th vertical line give the 6th frequency；First horizontal line gives the 7th frequency；First vertical line, the second vertical line and third are horizontal
Line gives the 8th frequency；Second horizontal line gives the 9th frequency；
(3) third group different frequency is combined:
Third vertical line and the 4th vertical line give the tenth frequency；First vertical line and the second horizontal line give the 11st frequency；First horizontal line and
Three horizontal lines give the 12nd frequency；Second vertical line gives the 13rd frequency；
(4) the 4th group of different frequency is combined:
First horizontal line, third vertical line and the 4th vertical line give the 14th frequency；Second horizontal line and third horizontal line give the 15th frequency；The
One vertical line gives the 16th frequency；Second vertical line gives the 17th frequency；
(5) the 5th group of different frequency is combined:
First horizontal line, the second horizontal line, third horizontal line, the first vertical line and the 4th vertical line give the 18th frequency；Second vertical line gives the tenth
Nine frequencies；Third vertical line gives the 20th frequency；
(6) the 6th group of different frequency is combined:
First horizontal line, the second horizontal line, third horizontal line, the first vertical line and the 4th vertical line give the 21st frequency；Third vertical line is to the
22 frequencies；Second vertical line gives the 23rd frequency；
(7) the 7th group of different frequency is combined:
Third vertical line and the 4th vertical line give the 24th frequency；First horizontal line, third horizontal line, the first vertical line and the second vertical line are to the
25 frequencies；Second horizontal line gives the 26th frequency；
(8) the 8th group of different frequency is combined:
First horizontal line, the second horizontal line, third horizontal line, the second vertical line and third vertical line give the 27th frequency；First vertical line and
Four vertical lines give the 28th frequency.
(9) the 9th group of different frequency is combined:
First horizontal line, the second horizontal line, third horizontal line, the first vertical line and the 4th vertical line give the 29th frequency；Second vertical line and
Three vertical lines give the 30th frequency.
(10) the tenth group of different frequency is combined:
First horizontal line, third vertical line and the 4th vertical line give the 31st frequency；Second horizontal line, third horizontal line, the first vertical line and
Two vertical lines give the 32nd frequency.
5. the flicker fusion frequency critical value measurement method according to claim 1 based on set of digits identification, feature exist
In step 5) is to determine the value of each frequency in each group of combination of frequency using following formula:
fJ, i=F0+ Δ f ' (j-1)+Δ f (i-1), f1, B+1=F1
Wherein, fJ, iRefer to the value of i-th of frequency in the j-th day obtained combination of frequency of font digital frame from low to high, i
Value range be 1~B, the value range of j is 1~N；F0It is the lower limit of each round measurement range, F1It is each round measurement range
The upper limit, measurement range F0~F1It indicates, initial measurement range is 20HZ~50HZ；Δ f ' is adjacent two days font number
The difference between minimum frequency in the obtained combination of frequency of word frame, the value of Δ f ' is determined using following formula:
Wherein, BaIt is the sum of the number for the whole different frequencies for including in the obtained N group combination of frequency of N number of day font digital frame,
B is determined using following formulaaValue:
Wherein, BjIt is the number of different frequency in the j-th day obtained group of frequencies of font digital frame, is determined using following formula
BjValue:
B2=B3=...=BN=B, B1=B+1
Δ f is the difference between each side frequency in the same obtained combination of frequency of day font digital frame, using as follows
Formula determines the value of Δ f:
Δ f=N* Δ f '
f1, B+1It is the highest frequency value in the first day obtained combination of frequency of font digital frame.
6. the flicker fusion frequency critical value measurement method according to claim 1 based on set of digits identification, feature exist
In step 7) includes:
(7.1) when measured identifies that the number of flashing numerals is 0, the upper limit F of measurement range is reset1Do not know for measured
Not Chu N group different frequency combination in minimum frequency value, the lower limit F of measurement range0=F1- 2* Δ f, and return step 4)
(7.2) it when measured identifies that the number of flashing numerals is N, and each is digital 8, resets under measurement range
Limit F0The maximum frequency values in the combination of N group different frequency identified for measured, the upper limit F of measurement range1=F0+ 2* Δ f,
And return step 4)；
(7.3) when measured identify flashing numerals number be greater than 0 be less than N, and not all digital 8 when, reset measurement
The lower limit F of range0The maximum frequency values in the combination of N group different frequency identified for measured, the upper limit F of measurement range1=
F0+ Δ f ', judges F1-F0Whether less than 0.2, if it is entering (7.4) step, otherwise return step 4)；
(7.4) according to the flicker fusion frequency critical value formula (F of measured0+F1)/2, measurement accuracy formula (F1-F0)/2, obtain
The flicker fusion frequency critical value and measurement accuracy of the measured terminates measurement.
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